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检索条件"机构=Key Lab. of Power System Operation and Control"

共 116 条记录，以下是31-40 订阅

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High performance control Strategy for an Isolated Three-Phase Bidirectional AC/DC Converter

High performance Control Strategy for an Isolated Three-Phas...

引用

International Conference on power Electronics and Drive systems (PEDS)

作者： Yixiong Zhou Chunguang Ren Wenping Qin Xiaoqing Han Peng Wang Baifu Zhang Shanxi Key Lab. of Power System Operation and Control Taiyuan University of Technology Taiyuan China Shanxi Key Lab. of Power System Operation and Control Taiyuan University of Technology Taiyuan China

This paper proposes a novel control strategy consisting of dual-phase-shifting (DPS) plus variable frequency for front-end dual-active-bridge (DAB) and 33% pulse width modulation (PWM) for three-phase inverter. The primary goal is to realize the linear control of output power which will reduce the control complexity and improve dynamic response, while at the same time achieving a high-efficiency bidirectional DAB inverter. A model has been built and tested using the proposed strategy on MATlab.Simulink. The simulation result verified the validity of the proposed strategy.

关键词： Inverters Pulse width modulation AC-DC power converters control systems Frequency control power generation power systems

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Isolation fault forecasting model for intelligent high voltage circuit breaker

Isolation fault forecasting model for intelligent high volta...

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2011 1st International Conference on Electric power Equipment - Switching Technology, ICEPE2011

作者： Teng, Yun Xu, Jianyuan Lin, Xin Liaoning Provincial Key Lab. of Power System Safe Operation and Monitoring Shenyang University of Technology Shenliao Xi Road 111 Shenyang 110870 China

ISBN: (纸本)9781457712722

A novel risk forecasting model of high voltage circuit breaker insulation based on double artificial neural networks is proposed in the paper by analysis of the relationship between ESDD, flashover voltage and environmental factors. The data used to build the forecasting model is obtained from artificial pollution test. The proposed insulation fault risk forecasting model calculates the insulation fault probability under given environmental factors. Results of artificial pollution text indicate that the forecasting of this method is satisfied to practical application and useful to theoretical research. © 2011 IEEE.

关键词： Pollution

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Software and hardware design of microcomputer relay protection device based on DSP 2

Software and hardware design of microcomputer relay protecti...

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2023 2nd International Conference on power system and power Engineering, PSPE 2023

作者： Huo, Jingchong Meng, Runquan Li, Shengwen Liu, Qiang Shanxi Key Lab of Power System Operation and Control Taiyuan University of Technology Taiyuan030024 China Electric Power Research Institute State Grid Shanxi Electric Power Company Taiyuan030001 China

The research on fault protection technology of AC power grid in AC/DC hybrid microgrid is very mature, while the research on fault protection technology of DC microgrid is still in the development stage. Therefore, the research and development of necessary power electronics and protection devices have become a research hotspot in recent years. In this paper, a microcomputer protection device based on the TMS320F28335 chip is developed. Considering the anti-interference of field use, detailed hardware and software design is carried out. The debugging effect is good, and the low-voltage DC short-circuit fault protection function can be reliably realized. © Published under licence by IOP Publishing Ltd.

关键词： Microcomputers

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Robust optimization scheduling of microgrid considering a tiered carbon trading mechanism and flexible loads 3

Robust optimization scheduling of microgrid considering a ti...

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2024 3rd International Conference on Green Energy and power systems, ICGEPS 2024

作者： Li, Xiaoxu Yang, Qianjie Qin, Wenping Shanxi Key Lab of Power System Operation and Control Taiyuan University of Technology Shanxi Taiyuan030024 China State Grid Yuncheng Power Supply Company Shanxi Yuncheng044000 China

Considering the comprehensive demand response, stepwise carbon trading, and uncertainty of wind power output for cogeneration microgrids, relevant optimization scheduling research will be carried out. The electric heating load is divided into non-dispatchable electric heating load and dispatchable electric heating load. By introducing electric heating demand and tiered carbon trading, the economic and low-carbon operation of microgrids can be achieved. The fluctuation of the output of new energy units is reflected using probability scenario sets in statistics, and a robust optimization model with related distributions is constructed using the C&CG algorithm to calculate and solve the established model. The simulation and comparison of numerical examples show that the microgrid energy management scheme formulated by the model established in this paper has good economic and environmental friendliness, and it also simultaneously validated the superiority of distributed robust optimization methods over traditional optimization methods © Published under licence by IOP Publishing Ltd.

关键词： Numerical methods

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Energy storage system participates in frequency modulation control and capacity balance strategy of power system 5

Energy storage system participates in frequency modulation c...

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5th IEEE International Electrical and Energy Conference, CIEEC 2022

作者： Wang, Zhenyang Zhai, Wenchao Yan, Gangui Zhao, Yue Cui, Youshi Jia, Xihao Northeast Electric Power University Dept. Min. of Educ. Key Lab. of Modern Power System Simulation Control and Green Power Technology Jilin China

ISBN: (数字)9781665411042

ISBN: (纸本)9781665411042

The grid-connected wind power generation leads to frequent frequency safety problems in the system, and new primary frequency modulation measures are urgently needed. In order to ensure the economy and safety of power grid operation, it is necessary to conFigure energy storage system for wind farm. In this paper, the control strategy is designed to use energy storage for primary frequency modulation. At present, the SOC imbalance of internal battery components is common in energy storage batteries. Therefore, this paper proposes an adjustable capacity proportional equalization control algorithm based on the current capacity of energy storage batteries. According to the different SOC of each battery component of energy storage batteries and its operating state (charge and discharge), it determines how to reasonably distribute the power deviation signal generated by frequency modulation to each energy storage battery component, so that the energy storage battery can not only support the frequency adjustment of power grid, but also improve its own SOC imbalance. Finally, based on EMTDC/PSCAD simulation model, the effectiveness of this method is verified. Simulation results show that this method can effectively balance the system SOC. © 2022 IEEE.

关键词： Frequency modulation

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The fault simulation experiment and feature extraction of rolling bearing based on casing measuring point

The fault simulation experiment and feature extraction of ro...

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Joint Conference on Machinery Failure Prevention Technology Conference, MFPT 2016 and ISA's 62nd International Instrumentation Symposium, IIS 2016

作者： Han, Te Jiang, Dongxiang Wang, Nanfei State Key Lab. of Control and Simulation of Power System and Generation Equipments Department of Thermal Engineering Tsinghua University Beijing100084 China

In this paper, the reliability of the rolling bearing fault feature extraction based on casing vibration signals is discussed. Through the fault simulation experiment of rolling bearing, the vibration data of the outer ring fault, inner ring fault and rolling element fault, which respectively comes from bearing block measuring point and casing measuring point, is acquired. Then this paper analyzed the data from the time domain, frequency domain and amplitude domain. Analysis results show that, compared to the bearing block measuring points, due to the attenuation of the pulse signal of the fault in the transmission way and the increase of signal to noise on the casing, the fault features of casing vibration signals are significantly weakened. The envelope demodulation, FFT change on the vibration signal of casing directly cannot extract the fault characteristics. However the fault characteristic frequency can be extracted from the appropriate resonance frequency band. The results provide a reference for the fault feature extraction of rolling bearing based on the signal of casing. © 2016, Society for Machinery Failure Prevention Technology. All rights reserved.

关键词： Roller bearings

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Distribution system fault location method using reclosure-generating traveling waves

Distribution system fault location method using reclosure-ge...

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2020 IEEE power and Energy Society General Meeting, PESGM 2020

作者： Dong, Xinzhou Wang, Haozong Xin, Zeyu Shi, Shenxing Wang, Bin Tsinghua University State Key Lab. of Control and Simulation of Power System and Generation Equipment Dept. of Electrical Engineering Beijing China

ISBN: (纸本)9781728155081

Fault location in distribution systems includes 2 subtasks: fault distance estimation and fault section identification. This paper presents a fault location method based on reclosure-generating traveling waves and system topology. Firstly, the reclosure-generating traveling waves under normal and fault conditions are analyzed to find the traveling wave reflected by fault point, through which the fault distance could be estimated. Secondly, we propose a fault section identification method by comparing real measured traveling waves with simulated traveling waves with different potential fault points. Noticing that only time information of traveling waves rather than their magnitude is necessary, instead of using electromagnetic transient simulation, we also present a simplified simulation algorithm that only focuses on the arrival time of traveling waves based on priority queue. Experiments demonstrate that the proposed method can locate fault points in high accuracy with low computational burden. © 2020 IEEE.

关键词： Location

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A control Strategy for T-Type Three-Level Converter to Suppress Midpoint Voltage Fluctuation

A Control Strategy for T-Type Three-Level Converter to Suppr...

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IEEE Conference on Energy Internet and Energy system Integration (EI2)

作者： Guanfei Hao Chunguang Ren Baifu Zhang Jiansheng Kong Dongxin Guo Xiaoqing Han Shanxi Key Lab. of Power System Operation and Control Taiyuan University of Technology Taiyuan China

ISBN: (纸本)9781665434263

T-type three-level converter is widely used in high-current and low- voltage fields owing to its small number of power devices, low on state loss and high power density. Midpoint potential balance control of T-type converter is one of its key technologies. The neutral point potential imbalance increases harmonic distortion rate of output voltage and current, and reduce service life of DC side capacitor. This paper proposes midpoint potential balance control strategy in view of PIR-controlled zero-sequence voltage to control offset and fluctuation of midpoint potential. Functional model between midpoint current, reactive current and active current and the functional link between SPWM and SVPWM are established. The control strategy is simple in calculation and fast in dynamic response. It can realize midpoint potential balance domination under different power factors and the suppression of low-frequency voltage pulsation. Ultimately, simulations verify the effectiveness and correctness of proposed domination tactics.

关键词： Space vector pulse width modulation Electric potential Reactive power Fluctuations Voltage fluctuations Capacitors Modulation

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Combination Result of Two MPPT Techniques (Fuzzy Logic and Perturb and Observe Method): Comparison with The Conventional Perturb and Observe Method

Combination Result of Two MPPT Techniques (Fuzzy Logic and P...

引用

IEEE Conference on Energy Internet and Energy system Integration (EI2)

作者： Djikeussi Ghislain Xuejin Li Shanxi Key Lab. of Power System Operation and Control Taiyuan university of technology Taiyuan China

ISBN: (纸本)9781665434263

Extracting maximum power from a photovoltaic generator, regardless of meteorological conditions, remains a challenge in the field of solar photovoltaics. Therefore, techniques have been developed to find the best operating point of a photovoltaic module. These include the conventional perturbation and observation method and the fuzzy logic technique. In this paper, we present the combination of two MPPT methods, namely the perturbation and observation method and the fuzzy logic method. We aim to show whether the combination of two different MPPT techniques for a solar system is more accurate and efficient in determining the peak power point than the conventional perturbation and observation method alone.

关键词： Maximum power point trackers Photovoltaic systems Fuzzy logic Perturbation methods system integration Generators Solar system

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Variable Frequency Phase-Shift Modulation Technique for Single Stage Dual-Active-Bridge AC-DC Converter 11

Variable Frequency Phase-Shift Modulation Technique for Sing...

引用

11th International Conference on power Electronics - ECCE Asia, ICPE 2023-ECCE Asia

作者： Guo, Dongxin Wang, Panbao Ren, Chunguang Guerrero, Josep M. Harbin Institute of Technology School of Electrical Engineering and Automation Harbin China Taiyuan University of Technology Shanxi Key Lab. of Power System Operation and Control Taiyuan China Aalborg University Department of Energy Technology Aalborg Denmark

ISBN: (纸本)9788957083505

This article proposes a variable frequency phase-shift modulation technique for single stage dual-active-bridge (DAB) AC-DC converter. This isolated single-stage single-phase converter consists of a DAB and a full bridge (FB) inverter. The proposed strategy applies a composite control strategy combining frequency modulation and extended phase shift (EPS) method to overcome the drawback of the non-linear power control of traditional phase-shift control scheme, which significantly reduces the complexity of the controller algorithm. Moreover, the synchronous inverter control applied to the back-end FB inverter is designed, which can realize the energy conversions in a single-stage, and a high frequency (HF) filter capacitor can replace the electrolytic capacitor at the output side DC-link. Thus, the safety of system operation improves and the power density of the system increases. Finally, simulation results confirm the validity and practical feasibility of the proposed control strategy. © 2023 The Korean Institute of power Electronics.

关键词： Electrolytic capacitors

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